On
October 28, 2009, Active Power, Inc. (Active Power or the Company) received notification from the NASDAQ Listing Qualifications department that the Company has regained compliance with the $1.00 minimum bid price
requirement for continued listing set forth in NASDAQ Listing Rule 5450(a)(1) (the Minimum Bid Price Rule).

As
previously disclosed, on August 18, 2008, NASDAQ notified Active Power that its common stock failed to maintain a minimum bid price of $1.00 over the previous 30 consecutive business days as required by the Minimum Bid Price Rule. Active Power
was granted a grace period of 180 days in which to regain compliance. NASDAQ subsequently notified Active Power of suspension of its enforcement of the Minimum Bid Price Rule, most recently until December 2, 2009. Since the time of such
notifications, the closing bid price of the Companys common stock has been at $1.00 per share or greater for at least 10 consecutive business days. Accordingly, the Company has regained compliance with the Minimum Bid Price Rule.

A copy of the press release issued by the Company on October 29, 2009 with respect to this matter is attached hereto as
Exhibit 99.1.